TOKYO (Reuters) – SoftBank Group Corp shares closed at a record high on Tuesday, surpassing a peak reached at the height of the dot-com bubble, as online backers celebrated the recovery in the value of the firm’s tech portfolio.

Shares in SoftBank, a heavily weighted component of the Nikkei 225 index which is trading at 30-year highs, closed up 4% at 10,420 yen, above the record 10,111 yen reached in February 2000.

Underpinned by buybacks and with retail investors buying its shares and baseball-themed junk bonds, SoftBank’s shares have been supported by a growing number of portfolio companies listing in ebullient markets.